2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4853This is an introduction to the ekpyrotic scenario, with an emphasis on the two contexts of brane cosmology and primordial universe scenarios. A self-contained introduction to brane cosmology and a qualitative overview and comparison of the inflationary, pre-big bang and ekpyrotic scenarios are given as background. The ekpyrotic scenario is then presented in more detail, stressing various problems.70 pages, LaTeX2e. Based on a Ph.D. thesis. v2: Added references and a mention of TeV-scale extra dimensionsAstrophysicsHigh Energy Physics - Theorytext